Alright so I watched that, following you Shake and got a few things to say.
First, you really didn't have any major flaws in your playstyle so don't take this like I think you are a poor player, esp just from this replay.
Your Sedna was the weakest player on your team, and she did a Panther build, which is the proper build to do against a 2x UB combo, for sure. However, she purchased the /vast/ majority of citadel upgrades. Now, Panther builds are really cheap builds so that isn't a huge issue.
However, your team just hit WS3 and you have 1700 gold and a health pot. You didn't get currency. Sedna ended up getting it a few minutes later and also she ended up dying. If she hadn't had to purchase cur at that time she would have had a little more hp/mana and possibley would have survived. Additionally, your team would have gotten roughly a 750 gold advantage.
Same thing with catapults. You purchase Narmoth's Ring instead. Then you buy Hurlington's.
Now, you were getting kills and so that justifies you 'awesome' kit. However, your Sedna was really stuggling and feeding kills. If you had given up half of your kills such that the Sedna died half as much simply by being less of a 'bamf'... well you may have won.
There were a few times you could have saved her as well it was unfortunante you either weren't watching the map or you decided she was not worth saving, esp since the Oak repeatably ported and was really on the ball when it came to helping allies.
You burnt your batswarms a few times killing minions while enemy demigods were nearby and you didn't use bite/mist always effectively (biting an opponent chasing a friendly when you could have, for example) but both of those can be explained by just imperfect map awareness.
Anyway, that Sed certainly lost that game for you, sadly. But that has little to do with UB being OP. Rather Sed just being underequipped and not knowing how to deal with a UB very well.
